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Finding the Fourth Proportional to 1,116.84, 1,675.42 and 386.24

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Solution

The fourth proportional to 1,116.84, 1,675.42 and 386.24 is: 579.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,116.84 : 1,675.42 = 386.24 : x
  2. Step 2: Convert to fraction form
    1,116.84/1,675.42 = 386.24/x
  3. Step 3: Cross multiply
    1,116.84x = 1,675.42 × 386.24
  4. Step 4: Simplify right side
    1,116.84x = 647,117.44
  5. Step 5: Solve for x
    x = 647,117.44/1,116.84
  6. Step 6: Final answer
    x = 579.42

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.